Rapid Alkalinization Factor 22 Is a Key Modulator of the Root Hair Growth Responses to Fungal Ethylene Emissions in Arabidopsis

    September 2024 in “ PLANT PHYSIOLOGY ”
    Rafael J. L. Morcillo, Jesús Leal‐López, Alberto Férez-Gómez, Lidia López‐Serrano, Edurne Baroja‐Fernández, Samuel Gámez‐Arcas, Germán Tortosa, Leonel E. Lopez, José M. Estevez, Verónica G. Doblas, Laura Frías-España, María D. García‐Pedrajas, Jorge Luis Sarmiento-Villamil, Javier Pozueta‐Romero
    TLDR RALF22 is essential for root hair growth in response to fungal emissions in Arabidopsis.
    The study explores the role of RAPID ALKALINIZATION FACTOR 22 (RALF22) in modulating root hair growth responses to fungal ethylene emissions in Arabidopsis. It reveals that RALF22 is essential for the signaling pathways involving ethylene, auxin, and photosynthesis that drive root hair proliferation and elongation in response to fungal volatile compounds. Mutants lacking RALF22 or its receptor FERONIA exhibited weak root hair responses, underscoring their importance in the signaling process. The research also highlights the interaction between ethylene and sugar signaling in root hair development, suggesting that RALF22 and FERONIA facilitate efficient fungal ethylene perception and root hair growth, potentially aiding the plant in hosting microorganisms.
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